/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.seata.core.event;

import java.util.Set;

/**
 * The interface for event bus.
 *
 */
public interface EventBus {
    /**
     * Register.
     *
     * @param subscriber the subscriber
     */
    void register(Object subscriber);

    /**
     * Unregister.
     *
     * @param subscriber the subscriber
     */
    void unregister(Object subscriber);

    /**
     * Unregister all.
     */
    void unregisterAll();

    /**
     * Post.
     *
     * @param event the event
     */
    void post(Event event);

    /**
     * Gets subscribers.
     *
     * @return the subscribers
     */
    Set<Object> getSubscribers();
}
